In 1674, reformed pirate Sir Henry Morgan is a high official in Jamaica. Edward Maynard hopes to win a large reward by proving Morgan still dabbles in piracy. Maynard goes undercover as ship's surgeon with a Morgan henchman.who's been supplanted by the notorious Blackbeard himself. Also on board the ship is Edwina Mansfield, seemingly a damsel in distress, to whom there's much more than meets the eye....